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Old 01-04-2021, 01:51 PM
Essexmetal Essexmetal is online now
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Join Date: Sep 2012
Location: Novi, MI
Posts: 207
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I will add something when using the sand packed method.



On one of the end caps weld at least a 1/2" nut and use a bolt that will press against the packed sand with a disc / or cup if you can turn one. This gives you some preload on the sand. Don't over do it with the preload, you want counter pressure not forming pressure.


As noted very dry sand. Patients and a soft red heating. If you can clamp one tail, be able to heat it and get the form dropped into place look for a way to attach a come-along to the moving end so you can keep a little pulling force to gauge against your heating. To keep it controlled do in 1" bands. Concentrate on the outside (that will stretch) and the inside (that will compress). The top and bottom of the bend or neutral axis will not need as much heat. Too much heat is always worse than not enough.
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Rick Mammel
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